Diketahui baris aritmetika 2,6,10,…. tentukan U40​

Jawaban:

a = 2 dan b = 4

jawab

Un = a + (n – 1)b

U40 = 2 + (40 – 1)4

= 2 + 156

= 158

jadi U40 adl 158

Jawaban:

2, 6, 10, …

U1 = 2 = 4(1) – 2

U2 = 6 = 4(2) – 2

U3 = 10 = 4(3) – 2

maka, Un = 4n – 2

U40 = 4(40) – 2

= 160 – 2

= 158